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          vue之模板语法
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              <time title="创建时间：2020-03-16 09:25:03 / 修改时间：09:54:23" itemprop="dateCreated datePublished" datetime="2020-03-16T09:25:03+08:00">2020-03-16</time>
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        <p>click look more</p>
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<blockquote>
<p>开始复习vue的基础知识，为了后续做准备</p>
</blockquote>
<blockquote>
<p>vue.js使用了基于html模板语法，并且能声明式的将dom绑定至底层vue的实例上的数据。在底层的实现上，又将这些模板语法编译为虚拟dom渲染函数。</p>
</blockquote>
<h1 id="插值"><a href="#插值" class="headerlink" title="插值"></a>插值</h1><h2 id="文本"><a href="#文本" class="headerlink" title="文本"></a>文本</h2><blockquote>
<p>数据绑定的最常见的形式就是使用Mustache语法，在之前学的ejs模板语法也是使用的Mustache。</p>
</blockquote>
<figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">&lt;!-- 这里的msg对应的是vue实例上对应的msg数据，他会响应式的变化，即vue实例中msg数据变化了，html中的插值也会变化 --&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">span</span>&gt;</span>Message: &#123;&#123; msg &#125;&#125;<span class="tag">&lt;/<span class="name">span</span>&gt;</span></span><br></pre></td></tr></table></figure>

<p>既然会响应式的变化，那么肯定会有一个需求就是不想让他响应式，即只变化一次。可以使用v-once指令</p>
<figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">span</span> <span class="attr">v-once</span>&gt;</span>Message: &#123;&#123; msg &#125;&#125;<span class="tag">&lt;/<span class="name">span</span>&gt;</span></span><br></pre></td></tr></table></figure>

<h2 id="原始html"><a href="#原始html" class="headerlink" title="原始html"></a>原始html</h2><blockquote>
<p>什么意思呢？通过上面可知一二。能发现vue的Mustache是将数据解释为文本，但是有时候想直接上去丢一段html代码怎么办呢？可以使用<strong>v-html</strong>指令</p>
</blockquote>
<p><strong>但是要注意，这种很容易遭受xss攻击。所以不要对用户提供这种功能</strong></p>
<blockquote>
<p>当然还有<strong>JS表达式</strong>和<strong>Attribute</strong>的用法，这里不深究，用的多就懂了</p>
</blockquote>
<h1 id="指令"><a href="#指令" class="headerlink" title="指令"></a>指令</h1><blockquote>
<p>指令是带有<strong>v-</strong>前缀的特殊attribute。一般来说，指令的值的预期都是单个JS表达式，但是v-for是例外的。因为v-for都是用来循环组件输出，需要写循环语句，例如（item of items）、并且还与:key连用。这里不多讲了。 </p>
</blockquote>
<h2 id="参数"><a href="#参数" class="headerlink" title="参数"></a>参数</h2><blockquote>
<p>有一些指令可以通过冒号后面接一个参数名。</p>
</blockquote>
<p>这句话的意思就是告知v-bind指令将href和url值绑定</p>
<figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">a</span> <span class="attr">v-bind:href</span>=<span class="string">"url"</span>&gt;</span>...<span class="tag">&lt;/<span class="name">a</span>&gt;</span></span><br></pre></td></tr></table></figure>

<p>可能上面的现在看不出有啥卵用，但是下面的一定就懂了。</p>
<figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">a</span> <span class="attr">v-on:click</span>=<span class="string">"eventFun"</span>&gt;</span>...<span class="tag">&lt;/<span class="name">a</span>&gt;</span></span><br></pre></td></tr></table></figure>

<h2 id="动态参数"><a href="#动态参数" class="headerlink" title="动态参数"></a>动态参数</h2><blockquote>
<p><strong>文档：可以用方括号括起来的 JavaScript 表达式作为一个指令的参数</strong></p>
</blockquote>
<blockquote>
<p>看着文档挺复杂，先看个代码。但是核心意思就<strong>方括号</strong>里面的attributeName是一个动态的，即可变的。具体点，就是说这个动态的参数可以被vue实例中data中的attributeName的值所改变</p>
</blockquote>
<figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">a</span> <span class="attr">v-bind:</span>[<span class="attr">attributeName</span>]=<span class="string">"url"</span>&gt;</span> ... <span class="tag">&lt;/<span class="name">a</span>&gt;</span></span><br></pre></td></tr></table></figure>

<h1 id="缩写"><a href="#缩写" class="headerlink" title="缩写"></a>缩写</h1><h2 id="v-bind"><a href="#v-bind" class="headerlink" title="v-bind"></a>v-bind</h2><figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">&lt;!-- 完整语法 --&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">a</span> <span class="attr">v-bind:href</span>=<span class="string">"url"</span>&gt;</span>...<span class="tag">&lt;/<span class="name">a</span>&gt;</span></span><br><span class="line"></span><br><span class="line"><span class="comment">&lt;!-- 缩写 --&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">a</span> <span class="attr">:href</span>=<span class="string">"url"</span>&gt;</span>...<span class="tag">&lt;/<span class="name">a</span>&gt;</span></span><br><span class="line"></span><br><span class="line"><span class="comment">&lt;!-- 动态参数的缩写 (2.6.0+) --&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">a</span> <span class="attr">:</span>[<span class="attr">key</span>]=<span class="string">"url"</span>&gt;</span> ... <span class="tag">&lt;/<span class="name">a</span>&gt;</span></span><br></pre></td></tr></table></figure>

<h2 id="v-on"><a href="#v-on" class="headerlink" title="v-on"></a>v-on</h2><figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">&lt;!-- 完整语法 --&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">a</span> <span class="attr">v-on:click</span>=<span class="string">"doSomething"</span>&gt;</span>...<span class="tag">&lt;/<span class="name">a</span>&gt;</span></span><br><span class="line"></span><br><span class="line"><span class="comment">&lt;!-- 缩写 --&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">a</span> @<span class="attr">click</span>=<span class="string">"doSomething"</span>&gt;</span>...<span class="tag">&lt;/<span class="name">a</span>&gt;</span></span><br><span class="line"></span><br><span class="line"><span class="comment">&lt;!-- 动态参数的缩写 (2.6.0+) --&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">a</span> @[<span class="attr">event</span>]=<span class="string">"doSomething"</span>&gt;</span> ... <span class="tag">&lt;/<span class="name">a</span>&gt;</span></span><br></pre></td></tr></table></figure>


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